Colloidal Iron Oxide Transport in Sandy Soil Induced by Excessive Phosphorus Application 1

Zhang, M. K.; He, Zhenli; Calvert, D. V.; Stoffella, P. J.

doi:10.1097/01.ss.0000090802.06903.bc

Cited by 20 publications

(18 citation statements)

References 21 publications

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“…3). Generally, our results correspond to the findings of Zhang et al (2003) and Siemens et al (2004) that P additions or increasing P saturation induce the release of colloids and colloidal P from soils. However, in contrast to Siemens et al (2004), who reported a nonlinear relationship between the concentration of KCl‐extractable colloidal P and DPS, we found a rather linear relationship (Fig.…”

Section: Discussionsupporting

confidence: 93%

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Colloidal and Dissolved Phosphorus in Sandy Soils as Affected by Phosphorus Saturation

2005

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Fertilization exceeding crop requirements causes an accumulation of phosphorus (P) in soils, which might increase concentrations of dissolved and colloidal P in drainage. We sampled soils classified as Typic Haplorthods from four fertilization experiments to test (i) whether increasing degrees of phosphorus saturation (DPS) increase concentrations of dissolved and colloidal P, and (ii) if critical DPS levels can be defined for P release from these soils. Oxalate-extractable concentrations of P, iron (Fe), and aluminum (Al) were quantified to characterize DPS. Turbidity, zeta potential, dissolved P, and colloidal P, Fe, Al, and carbon (C) concentrations were determined in water and KCl extracts. While concentrations of dissolved P decreased with increasing depth, concentrations of water-extractable colloidal P remained constant. In topsoils 28 +/- 17% and in subsoils 94 +/- 8% of water-extractable P was bound to colloids. Concentrations of dissolved P increased sharply for DPS > 0.1. Colloidal P concentrations increased with increasing DPS because of an additional mobilization of colloids and due to an increase of the colloids P contents. In addition to DPS, ionic strength and Ca(2+) affected the release of colloidal P. Hence, using KCl for extraction improved the relationship between DPS and colloidal P compared with water extraction. Accumulation of P in soils increases not only concentrations of dissolved P but also the risk of colloidal P mobilization. Leaching of colloidal P is potentially important for inputs of P into water bodies because colloidal P as the dominant water-extractable P fraction in subsoils was released from soils with relatively low DPS.

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Section: Discussionsupporting

confidence: 93%

“…Zhang et al (2003) reported that application of P to sandy soils packed into columns induced the mobilization of colloidal P and Fe. In accordance with this finding, Siemens et al (2004) showed that sorption of P caused the release of colloidal P from sandy soils in batch experiments.…”

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Colloidal and Dissolved Phosphorus in Sandy Soils as Affected by Phosphorus Saturation

2005

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“…This is in accordance with the conclusion that P adsorption on soil and sediment is determined by the surface charge and the protonation state of P in the bulk solution varying with pH (Zhou et al 2005). Furthermore, it is worth mentioning that another probable reason for the positive correlation between P coll and dissolved P is that the shift of the surface charge to more negative values enhanced the colloidal stability of these oxides by the adsorption of P, which was in agreement with previous studies (Zhang et al 2003;Siemens et al 2004;Ilg et al 2008). Overall, both colloid release and its surface P adsorption, which were affected by pH, contributed to the increased P coll concentrations.…”

Section: Effects Of Ph On Soil P Coll Releasesupporting

confidence: 90%

Effect of pH on the release of soil colloidal phosphorus

Liang¹,

Liu

Chen³

et al. 2010

J Soils Sediments

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Purpose Colloid-facilitated phosphorus (P) has been proved as a significant contributor to eutrophication. Release of colloidal phosphorus (P coll ) depends on the released soil colloids and their P adsorption abilities, both of which are greatly affected by pH. The aim of the study was to assess the effect of pH in a wide range on P coll loss of the top silt loamy soil rich in organic matter and P for the successful description and prediction of P transport. Materials and methods In batch experiment, soil samples were shaken with deionized water in a wide range of pH from 1.4 to 9.9 for 24 h. Then water-dispersible colloids (WDCs) were extracted by pre-centrifugation, microfiltration, and ultracentrifugation processes orderly and determined gravimetrically. The P coll values at each pH were calculated as the difference between the concentration of total P in nonultracentrifuged and ultracentrifuged samples. The same method was applied for the released colloidal mineral elements (Al, Fe, Ca, Si, Mg, Mn). Colloid morphology and P distribution on colloid surface were directly illustrated by transmission electron microscope (TEM) and scanning electron microscope-energy-dispersive X-ray spectroscopy (SEM-EDS) mapping scanning analyses. Results and discussion Over pH 4.6-6.0, the released P coll was below 5.5 mgkg -1 soil, while up to 66.8 mgkg -1 soil and 28.5 mgkg -1 soil at pH 1.4 and 9.9, respectively, indicating that both high and low pH values enhanced the mobilization of P coll . At the low pH, the potential loss of P coll mainly resulted from the dissolution of inorganic encasing cement such as Al oxides and clay mineral. However, besides electrostatic repulsion, dissolution of organic coating at high pH enhanced the P coll release as revealed by the SEM-EDS results. The P was heterogeneously distributed on the WDCs and might be associated with soil organic matter, Al oxides, Fe oxides (oxyhydroxide), and clay mineral at the low pH, while mainly with Fe oxides and less clay mineral at the high pH. Conclusions Both high and low pH enhanced colloid and P coll releases. This study first visually revealed that the dissolution of organic cement at high pH enhanced the release of WDCs and their facilitated P coll release. The exceptional loss risk of P coll may be caused by soil acidification due to the dissolution of inorganic cements, especially in Al-rich soils, and by the enhanced high soil pH due to the dissolution of organic coating in the organic matter-rich soils.

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“…In experiments with packed soil columns containing Wabasso sand (Alfic Haplaquod), Zhang et al (2003) demonstrated that under conditions of alternating saturated and unsaturated flow, applications of P exceeding the soil's sorption capacity greatly increased the leaching of Fe oxides and associated P coll In batch experiments conducted by Siemens et al (2004), large concentrations of P coll were related to large degrees of P saturation (DPS) and sorption of P induced a release of P coll from soil samples. Similarly, Ilg et al (2005, 2008) showed that P coll concentrations of soil extracts increased with increasing DPS and P addition.…”

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confidence: 99%

“…Similarly, Ilg et al (2005, 2008) showed that P coll concentrations of soil extracts increased with increasing DPS and P addition. According to Zhang et al (2003), Siemens et al (2004), and Ilg et al (2005, 2008), the dispersing effect of P on soil colloids can be attributed to a shift of the surface charge of colloidal oxides to more negative values as a consequence of P sorption (Stumm and Sigg, 1979; Puls and Powell, 1992). It has been suggested that a shift of surface potentials to values below −20 mV thereby triggers the release of P‐containing Fe oxides from negatively charged quartz sand matrices (Ilg et al, 2008).…”

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confidence: 99%

Is Colloid‐Facilitated Phosphorus Leaching Triggered by Phosphorus Accumulation in Sandy Soils?

Siemens¹,

Ilg²,

Pagel³

et al. 2008

J of Env Quality

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The leaching of colloidal phosphorus (P(coll)) contributes to P losses from agricultural soils. In an irrigation experiment with undisturbed soil columns, we investigated whether the accumulation of P in soils due to excess P additions enhances the leaching of colloids and P(coll) from sandy soils. Furthermore, we hypothesized that large concentrations of P(coll) occur at the onset of leaching events and that P(coll) mobilized from topsoils is retained in subsoils. Soil columns of different P saturation and depth (0-25 and 0-40 cm) were collected at a former disposal site for liquid manure and at the Thyrow fertilization experiment in northeastern Germany. Concentrations of total dissolved P, P(coll), Fe(coll), Al(coll), optical density, zeta potential, pH, and electrical conductivity of the leachates were determined. Colloidal P concentrations ranged from 0.46 to 10 micromol L(-1) and contributed between 1 and 37% to total P leaching. Large P(coll) concentrations leached from the P-rich soil of the manure disposal site were rather related to a large P-content of colloids than to the mobilization of additional colloids. Concentrations of colloids and P(coll) in leachates from P-poor and P-rich columns from Thyrow did not differ significantly. In contrast, accumulation of P in the Werbellin and the Thyrow soil consistently increased dissolved P concentrations to maximum values as high as 300 micromol L(-1). We observed no first-flush of colloids and P(coll) at the beginning of the leaching event. Concentrations of P(coll) leached from 40-cm soil columns were not smaller than those leached from 25-cm columns. Our results illustrate that an accumulation of P in sandy soils does not necessarily lead to an enhanced leaching of colloids and P(coll), because a multitude of factors independent from the P status of soils control the mobility of colloids. In contrast, P accumulation generally increases dissolved P concentrations in noncalcareous soils due to the saturation of the P sorption capacity. This indicates that leaching of dissolved P might be a more widespread environmental problem in areas with P-saturated sandy soils than leaching of P(coll).

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Colloidal Iron Oxide Transport in Sandy Soil Induced by Excessive Phosphorus Application 1

Cited by 20 publications

References 21 publications

Colloidal and Dissolved Phosphorus in Sandy Soils as Affected by Phosphorus Saturation

Colloidal and Dissolved Phosphorus in Sandy Soils as Affected by Phosphorus Saturation

Effect of pH on the release of soil colloidal phosphorus

Is Colloid‐Facilitated Phosphorus Leaching Triggered by Phosphorus Accumulation in Sandy Soils?

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